6 
ASTRONOMICAL OBSERVATIONS. 
APPENDIX A—Continued. 
CAMP 19—AUGUST 4, 1855. 
Observer —Lieut. R. S. Williamson, 17. S. Top. Engineers. 
Object observed. 
Time of observ’n 
by chronometer. 
Observed double 
altitudes. 
h. 
m. 
5 . 
d. 
5 . 
Polaris.. 
8 
25 
19.0 
80 
47 
30 
8 
26 
12.5 
80 
47 
40 
8 
27 
09.5 
80 
48 
10 
8 
27 
52.0 
80 
48 
20 
8 
29 
31.0 
80 
49 
20 
8 
30 
40.0 
80 
50 
50 
8 
31 
20.0 
80 
51 
10 
8 
32 
04.0 
80 
51 
00 
8 
32 
44.5 
80 
51 
20 
8 
33 
39.0 
80 
51 
20 
8 
34 
29.5 
80 
52 
10 
Index error — 7' 00". Barometer, 27.3 in. Ther¬ 
mometer, 76°. 
CAMP 20—AUGUST 5, 1855. 
Observer —Lieut. R. S. Williamson, U. S. Top. Engineers. 
h. 
m. 
s. 
d. 
m. 
s. 
a Cygni. 
8 
39 
30.5 
115 
57 
50 
8 
41 
30.5 
116 
39 
20 
8 
43 
30.5 
117 
21 
30 
8 
45 
00.0 
117 
52 
20 
8 
46 
12.0 
118 
19 
00 
8 
47 
32.5 
118 
47 
00 
8 
48 
58.5 
119 
17 
50 
Arcturus. 
8 
01 
41.0 
95 
33 
50 
8 
03 
42.0 
94 
47 
10 
8 
05 
27.5 
94 
09 
50 
8 
07 
56.0 
93 
16 
20 
8 
09 
26.0 
92 
42 
50 
8 
12 
18.0 
91 
41 
00 
8 
14 
16.0 
90 
57 
30 
a Serpentarii.......... 
8 
19 
41.5 
123 
22 
10 
8 
21 
16.5 
123 
24 
40 
8 
23 
41.5 
123 
25 
20 
8 
24 
53.0 
123 
27 
40 
8 
25 
55.5 
123 
27 
30 
8 
26 
57.5 
123 
27 
40 
8 
28 
12.0 
123 
27 
00 
8 
29 
16.5 
123 
26 
30 
8 
30 
46.5 
123 
26 
20 
8 
31 
58.5 
123 
25 
10 
8 
33 
08.5 
123 
23 
50 
8 
35 
15.5 
123 
22 
00 
Polaris .. 
8 
56 
37.0 
81 
15 
30 
8 
57 
58.0 
81 
17 
10 
8 
59 
29.5 
81 
17 
50 
9 
00 
43.0 
81 
18 
40 
9 
02 
00.0 
81 
19 
20 
9 
03 
24.0 
81 
21 
00 
Index error — 6' 30". Barometer, 26.7 in. Ther¬ 
mometer, 64°.5. 
CAMP 21—AUGUST 6, 1855. 
Observer — Lieut. R. S. Williamson, U. S. Top. Engineers. 
Object observed. 
Time of observ’n 
by chronometer. 
Observed double 
altitudes. 
h. 
m. 
s . 
d. 
m. 
s. 
« Cygni. 
8 
10 
02.0 
107 
12 
30 
8 
11 
27.0 
107 
41 
00 
8 
12 
21.0 
108 
00 
40 
8 
13 
22.5 
108 
21 
30 
8 
14 
26.5 
108 
44 
00 
8 
15 
17.0 
109 
02 
10 
Arcturus.. 
8 
35 
05.0 
81 
32 
20 
8 
36 
42.5 
80 
55 
50 
8 
38 
55.5 
80 
05 
40 
8 
40 
24.0 
79 
33 
20 
8 
41 
41.0 
79 
05 
00 
8 
42 
52.5 
78 
37 
30 
a Serpentarii.. 
8 
17 
41.5 
123 
30 
30 
8 
18 
41.5 
123 
30 
50 
8 
19 
36.5 
123 
31 
30 
8 
20 
43.0 
123 
32 
40 
8 
21 
30.5 
123 
33 
00 
8 
22 
20.5 
123 
34 
20 
8 
23 
10.5 
123 
34 
20 
8 
24 
16.5 
123 
34 
00 
8 
25 
54.0 
123 
33 
20 
8 
26 
48.0 
123 
33 
20 
8 
28 
31.0 
123 
32 
30 
8 
29 
21.5 
123 
30 
30 
8 
30 
09.0 
123 
29 
00 
Polaris. 
8 
48 
22.5 
81 
05 
50 
8 
49 
31.5 
81 
06 
40 
8 
50 
34.5 
81 
07 
30 
8 
51 
30.0 
81 
08 
30 
8 
52 
33.0 
81 
09 
10 
8 
53 
18.0 
81 
09 
50 
Index error — 6' 30". Barometer, 26.7 in. Thermom¬ 
eter, 69°. 
CAMP 22—AUGUST 7, 1855. 
Observer — Lieut. R. S. Williamson, U. S. Top. Engineers. 
h. 
m. 
s. 
d. 
m. 
s. 
a Cygni. 
8 
28 
30.0 
115 
14 
00 
8 
29 
42.0 
115 
39 
40 
8 
32 
11.0 
116 
50 
30 
8 
33 
12.5 
116 
52 
50 
8 
34 
33.5 
117 
21 
10 
8 
36 
12.5 
117 
55 
20 
Arcturus... 
8 
03 
19.0 
91 
43 
00 
8 
04 
22.0 
91 
29 
00 
8 
05 
27.5 
90 
54 
00 
8 
06 
40.0 
90 
27 
50 
8 
07 
56.5 
89 
59 
50 
8 
09 
31.0 
89 
25 
40 
a Serpentarii. 
• • • • 
8 
12 
43.5 
123 
21 
10 
8 
13 
51.5 
123 
21 
20 
8 
14 
51.5 
123 
22 
50 
8 
15 
45.5 
123 
23 
30 
8 
17 
09.0 
123 
23 
30 
8 
18 
05.0 
123 
24 
00 
8 
18 
58.5 
123 
25 
00 
8 
20 
07.5 
123 
24 
40 
8 
20 
53.5 
123 
24 
30 
